Systemd documentation (#6490)

* commit '96d35f102':
  Systemd documentation (#6490)

changelog.d/6490.doc

@@ -0,0 +1 @@
+Update documentation and variables in user contributed systemd reference file.

contrib/systemd/matrix-synapse.service

@@ -4,8 +4,11 @@
 #    systemctl enable matrix-synapse
 #    systemctl start matrix-synapse
 #
+# This assumes that Synapse has been installed by a user named
+# synapse.
+#
 # This assumes that Synapse has been installed in a virtualenv in
-# /opt/synapse/env.
+# the user's home directory: `/home/synapse/synapse/env`.
 #
 # **NOTE:** This is an example service file that may change in the future. If you
 # wish to use this please copy rather than symlink it.
@@ -22,8 +25,8 @@ Restart=on-abort
 User=synapse
 Group=nogroup
 
-WorkingDirectory=/opt/synapse
-ExecStart=/opt/synapse/env/bin/python -m synapse.app.homeserver --config-path=/opt/synapse/homeserver.yaml
+WorkingDirectory=/home/synapse/synapse
+ExecStart=/home/synapse/synapse/env/bin/python -m synapse.app.homeserver --config-path=/home/synapse/synapse/homeserver.yaml
 SyslogIdentifier=matrix-synapse
 
 # adjust the cache factor if necessary

synapse/storage/data_stores/main/profile.py

@@ -159,9 +159,9 @@ class ProfileWorkerStore(SQLBaseStore):
 
 
 class ProfileStore(ProfileWorkerStore):
-    def __init__(self, db_conn, hs):
+    def __init__(self, database, db_conn, hs):
 
-        super(ProfileStore, self).__init__(db_conn, hs)
+        super(ProfileStore, self).__init__(database, db_conn, hs)
 
         self.db.updates.register_background_index_update(
             "profile_replication_status_host_index",